I would look for some used sticks of 1 gb pc5300 at anandtech's for sale forum, or post a WTB (wanted to buy) and see if you get some responses. You may be able to get them for around $25 a pair shipped. Lots of folks have leftover ddr2 for sale as they upgrade. I use crucial and hp ddr2, and they both work fine. I doubt you can use the 256 ram with the 1 gig; I would save them for spares and get 4 1 gig sticks. Post this in one of Dell's forums on their website to be sure they'll work. Dell boards can be picky about ram.